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Many different kinds of artificial lights help plants grow indoors, but fluorescent grow lights are the most affordable and adaptable, fitting into a variety of light fixtures. They, however, produce less intense light. This makes them an excellent supplement for plants already receiving some natural light, but a poor choice for plants that have no other source of light. Fluorescent grow lights are available in three different color tones, as well as in a high intensity version. Tropical and sub-tropical plant varieties are known to grow well in fluorescent light.